I'll offer the suggestion that your temporary improvement might be due to vasodilation. I.e., increased blood flow leads to increased Nitric Oxide production by the endothelium, which relaxes smooth muscle in arteries and thereby results in decreased workload for the heart. Eventually, NO level returns to what it was before and the benefit is gone.

Hi, Aaron. I've read your post of Aug 2008 while researching my own condition - which I believe originated with a common adenovirus and led to cardiovascular problems. You wrote: "The weird thing is, once I'm done a 20 minute workout or so, the heart feels BETTER (less strong) than it previously did, beating somewhat normal for about 1 hour after it slows down. But it comes back again ... it always does".
I've also experienced odd exercise effects.
[continued]

Aaron thanks alot for your insight It makes me feel alittle bit better to know that other people young like I am are experiencing similar things. I went and saw the EP Specialist. He said that he doesn't have any idea why my heart is oding this stuff. and there's nothing he can do. But his nurse said he would want to do an EP study. He changed his mind after he found out that I have no insurance. I just wish someonme could tell me why this is happening. ANd what exactly is wrong. TY so much for your help. I really appreciate it. Let me know how everything's goin.
Thanks Again
Brandie

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